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Calculating characteristics of an unknown ferrite toroid:

Often radio-enthusiast can found in his spare box some unknown ferrite toroid core. However, he doesn't know anything about its characteristics, he doesn't know the AL – the inductance factor or µ – the initial permeability of the core. So far as the magnetic flux is closed in the core and don't have an air gap, we can quite easy to estimate these values. We have to wind some turns on the core and to measure obtained inductance by using an LCR meter. The following calculator helps to determine characteristics of the toroid core. Here you can see the formulas that the calculator uses. You can download the cross-platform app Coil64 to determined the magnetic permeability of the toroid core offline.

ENTER THE INPUT DATA:

Select units:

N

=

– Number of turns

L

=

– Measured inductance

D1

– Outer diameter of ring

D2

– Inner diameter of ring

h

– Height of ring

Calculate

RESULT:

µ

=

– Initial magnetic permeability

AL

=

– Inductance factor of the core [nH/N2]

Clear all

The Ring_permeability plugin in Coil32 software allows to solve the same problem.

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The system consists of individual components including a controller, a stepping motor, a foot switch, power adapter and output shaft. This design makes it very easy for you to integrate the system into your own project.

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